Improvement in compositions for paint



.TNITED STATES PATENT OFFICE.

GUSTAVE BARRET AND ALEXANDRE 'DADHEMAR, OF POINTE-A-PITRE,

ISLAND on GUADELOUPE.

IMPROVEMENT IN CQMPOSITION FOR PAINT.

. Specification forming part of Letters Patent No. l79,990, dated July 18, 1876; application filed April 24, 1876.-

To all whom it may concern: 7

Be it known that we, GUSTAYE BARRET and ALEXANDRE DADHEMAR, citizens of France, both residing at Pointe-a-Pitre, in the vulcanized and siccative vehicle, 'to form asemi liquid paint.

This paintshould be applied to the desired object or surface while fresh, because the article quickly loses its fluidity in contact with the air.

' We have found to be effective such a vulcanization of the vehicle as is produced by boiling therewith a two hundredth part, by weight, of free sulphur. The coating thus prepared maybe applied with a brush, the

surface of the iron being thoroughly dry, 371d preferably, but not necessarily, hot.

The free sulphur in the composition attacks and combines with the superficial portion s.-

the-iron, which it, in fact, vulcanizes, and the effect is that the coating becomes incorporated with the substance of the metal, to which it firmly adheres as an integument.

Experiments lasting for five years demonstrate the fact that this coating remains intact, and resists effectively the scaling action of changes of temperature, and also efl'ectively. preserves the iron from the attacks of salt water and other destructive agents. This coating is also found to be proof against incrustation by mollusks. u

On the 21st of October, 1875, we filed an application for a patent for a compound of sulphides of iron with a siccative oil, which application was rejected.

We are well aware that it has long been proposed to use sulphide of iron mixed with oil as a paint for metals.

We claim as new and of ourinvention- The composition consisting of the natural sulphoaluininate of iron, (crotte a 0abm',) an

artificial sulphide of iron, and a vulcanized vehicle, substantially as set forth.

In testimony of which invention we hereunto set our hands.

eUsT vE BARRET. ALEXANDRE DADHEMAR.

AUEGSI} GHAMBERTRAND, 13. DE LABROUSSE. 

